Paralympic silver medalist Deepa Malik has alleged rude behaviour by a cabin crew member of TATA-SIA-run Vistara, prompting the airline to issue an apology.

Malik, who was travelling on Vistara's Mumbai-Delhi flight UK 902 on Tuesday when the incident happened, also complained to the airlines about "poor handling" of wheelchair-bound passengers by the airline staff.

In her onboard written complaint to the airline, she alleged that one of the cabin crew members behaved rudely with her when she was informing her mother on the phone that her flight from Mumbai was delayed.

"Crew member Priyanka was very rude in the flight. She told me to speak softly when I called parents to inform them about the delay in flight," she wrote in the complaint.

"On objecting, she said 'sweetheart, chill'," Malik wrote, adding that wheelchair handling was so poor that you do not know how to shift a person from seat to cabin chair. The entire staff stands and looks at each other for 10 minutes. No action."

She alleged that the cabin crew was not ready to help her reach the cabin seat as they were not trained.

Later, in a series of tweets, she urged the airline to treat physically challenged passengers with dignity.

She also tagged her tweets to Union Social Justice and Empowerment Minister Thaawar Chand Gehlot.

"Hope @airvistara takes note of my complaints and revert. More dignity for physically challenged passengers @socialpwds @TCGEHLOT (sic)," she said in another tweet.

After Malik, who made country proud by becoming first Indian woman to win a medal in Paralympic Games in Rio last month, went public about her complaint on the mirco-blogging site, Vistara apologied to her and assured her of a through probe and necessary action.

"As a team, we would like to sincerely apologise Deepa for her disappointing experience. We have been in touch with Deepa and are grateful for the feedback shared by her. We are investigating the incident thoroughly and will take all necessary corrective actions to ensure something like this never occurs again," Vistara said in a apology letter to Deepa.